Advanced Materials Research Vols. 156-157

Abstract: Radius Angle Histogram (RAH) is useful method of retrieving 3D mechanical models. This method, however, not completely uses the information of radius angle histogram of the model. As a result, the retrieval precision is not very high enough. To improve the retrieval efficiency, K-means clustering method (KMM) is proposed in this paper. The radius angle histograms of the models are established first and then be served as inputs as KMM, respectively. By using KMM, the models can be classified and the results can be obtained. To validate the proposed method, an experiment is given. The results show that the retrieval precision of the proposed method is higher than that of single using RAH method.

Abstract: To achieve the accurate duplication of product in reverse engineering, We proposed an algorithm for the optimization of NC tool-path based on scanning points, which can be realized through the following two steps. At first, we approximated NC tool-path by many tool-path segments according to the optimized accuracy. Then we adjusted the nodes of approximation tool-path so that it can match smoothing requirements. It has been proved by examples that the optimization algorithm can realize the optimization of NC tool-path for scanning points effectively and improve the efficiency of product processing significantly.

Abstract: La0.8-xPrxMg0.2Ni3.8 (x=0,0.15,0.3,0.4) alloys were prepared by induction melting followed by annealing treatment at 1173K for 24 h. Alloys structure and electrochemical properties of different Pr elecment have been studied systematically by X-ray diffraction(XRD) with the Rietveld methold , scanning electron microscope (SEM)and electrochemical experiments. Alloys structure analyses show that all of the alloys mainly consisted of complex phases such as (La,Pr,Mg)5Ni19 phase(Ce5Co19-type,SG:R-3m), (La,Pr,Mg)5Ni19 phase (Pr5Co19-type, SG:P63/mmc)and (La,Pr)Ni5 phase(CaCu5-type,SG:P6/mmm), Pr eletment was benefited to the formation of Pr5Co19-type phase, The (La,Pr,Mg)5Ni19 phase not only exists in high temperature area but also exists in low temperature area.The activation characteristic and maximum discharge capacity got worse with increasing Pr content,At the same time, The Pr5Co19–type phase and Ce5Co19–type phase all had better electrochemical cyclic stability than the PuNi3-type phase in earth–Mg–Ni-based Hydrogen Storage Alloys.The cyclic stability of alloy electrodes was a closely related to the stacking structures consisting of one Laves-type slab (AB2) and three CaCu5-type slabs (AB5) along the c-axis.

Abstract: A system is developed to detect output pressure of rail transit brake system and the principle of the system design is expatiated. The function and the implement method of each block in the system are also discussed. According to the problems existed in detection of rail transit brake system, we propose a new evaluation index to detect overall performance of rail transit brake system.

Abstract: When the gun chamber pressure is tested, its instantaneous high temperature up to 3000 , Sensor directly touches the high temperature gas. According to this special use environment, A novel method is proposed in this paper: the thermal barrier coating (TBC) is added to protect the sensor against its thermal deformity. And temperature characteristics of the sensor with TBC are analyzed through finite element. finally, its temperature characteristics were experimentally tested. Results show that the thermal barrier coating plaied heat insulation role, temperature stability of the sensor is good.

Abstract: The energy consumption and environmental impacts of a product are largely determined during concept design. It is the core for energy saving product development to integrate energy saving into product concept design process. In this paper, a framework for energy-saving product concept design based on TRIZ/function analysis is proposed, the energy flow chart is built based on the analysis of product function. By eliminating the harmful function associated with energy and environment, resolving the conflict parameter and attributes of components in energy and function, the new product that satisfy user needs while minimizing energy consumption is obtained. A case study is also presented to illustrate the effectiveness of the proposed design framework.

Abstract: The lake-type raw water was treated in a photocatalytic oxidization reactor. The experiment was carried out using ultrasonic under the condition of flow rate 10L/h, the padding packing compares 2/5, UV lamp 30W, non-additional chemicals, pH 7.35. Moremore, the raw water also was treated by ultrasonic / photocatalytic oxidization integrated process under the same control conditions. The results indicate that, after ultrasonic / photocatalytic oxidization process for 36 hours, the average removal of CODMn, TP, Chl-a and OD560 were 25.3%, 30.1%, 98.6% and 88.1%, respectively.

Abstract: There remain two kinds of the Wilson-θ methods, the Wilson-θ and methods named by author. In the Wilson-θ method, the accelerations are not modified by the dynamic equilibrium equations at the time ; in the Wilson-θ method, the accelerations are modified. The amplification matrixes of the Wilson-θ and methods for single-degree-of-freedom system are derived. The stabilities of the Wilson-θ and methods are examined by the spectral radii of the amplification matrixes. The stability of the Wilson-θ method is unconditional for . The calculation results indicate: the stability of the Wilson-θ method is not unconditional, its improvement of accuracy is slight; both the stability range and accuracy are less than the ones of the linear acceleration method, so the Wilson-θ method wouldn't be adopted.

Abstract: This study analysis the use requirement of engineering vehicles travel system, introduces the hydraulic system and the design scheme of automatic transmission system, discusses the control strategy and method of engineering vehicles travel speed, modeling and simulating based on the actual system software and hardware and the control Strategy and method of automatic transmission system, verifies the vehicle control effect through virtual test, and draws the full-text conclusion at last.

Abstract: The preparation of reinforced metal matrix composites used by the method of in-situ and laser cladding has become one of the interesting topics in the metal matrix composite materials. This method is adopted here to prepare the reinforced iron matrix exterior composites, and the critical task is to obtain the optimized technique parameters. The optimal process of manufacturing composite is traditionally defined via experimental methods of orthogonal arrays design, which is costly and can’t get the exact parameters. Hence, we firstly use the artificial neural network to fit the relationship between the performances of the composite and the parameters so as to construct the model of the process. And the parameters are optimized by genetic algorithm. The results further verified that the method in this paper is effective.